In the phrase "May the bluebird of happiness build a nest in your left nostril," the bluebird of happiness is a metaphorical and whimsical way of expressing a wish for joy, contentment, and well-being. The bluebird is often used as a symbol of happiness and positive emotions in literature and folklore.
The expression itself is a humorous and playful way to wish someone happiness, albeit in a quirky and unconventional manner. It's not meant to be taken literally but rather as a lighthearted and creative way to convey good wishes.
Description
The bluebirds are a North American group of medium-sized, mostly insectivorous or omnivorous birds in the order of Passerines in the genus Sialia of the thrush family. Bluebirds are one of the few thrush genera in the Americas. Bluebirds lay an average of 4 to 6 eggs per clutch. Wikipedia